Punch press die

ABSTRACT

A punch press tool includes a cylindrical punch guide in which a punch body provided with a punch tip for press forming is fit slidably. The punch tip consists of an appropriate number of long forming punch tips each including a press forming portion in the leading end thereof. The punch tip also consists of an appropriate number of clamping punch tips each with a shorter length compared with the forming punch tips. Both of the tips are attached to the punch body detachably and exchangeably.

TECHNICAL FIELD

The present invention relates to a punch press tool that is used forforming a workpiece precisely, which is to be used for, for example,electronic parts, through a process consisting of upward or downwardcut-and-raising and bending.

BACKGROUND ART

Conventionally, in order to form a bent part through, for example, adownward or upward cut-and-raising and bending process being performedon a portion of a workpiece that is to be used for, for example,electronic parts, a punch tool or die tool is made corresponding to thewidth of the bent part, and such tools are exchanged to be used fordifferent widths.

However, using the individual tools discussed above causes a problemthat it is necessary to make and prepare a large number of toolscorresponding to various widths of respective bent parts. Moreover,there is another problem that the width of each of the bent parts cannotbe designed freely.

The present invention is intended to solve the problems described above,and an object of the invention is to provide a punch press tool that iscapable of forming a bent part with a freely-designed width by downwardor upward cut-and-raising and bending.

DISCLOSURE OF THE INVENTION

In order to achieve the above object, a punch press tool according to afirst aspect of the present invention comprises: a cylindrical punchguide; a punch body fitted slidably within the aforesaid punch guide;and a punch tip to perform press forming; wherein the aforesaid punchtip includes an appropriate number of long forming punch tips eachincluding a press forming portion in the leading portion thereof and anappropriate number of clamping punch tip each having a shorter lengthcompared with the forming punch tips; and both of the aforesaid tips areattached to the aforesaid punch body detachably and exchangeably.

A punch press tool according to a second aspect of the present inventionis a punch press tool of the first aspect in which at least either theaforesaid forming punch tips and the aforesaid clamping punch tips aresplit into a plurality.

A punch press tool according to a third aspect of the present inventionis a punch press tool according to the first or the second aspect inwhich provided is a stripper having a guide hole for receiving andguiding both of the aforesaid tips in the leading end side of theaforesaid punch guide and provided is a projected portion for clamping aworkpiece in a position adjacent to the aforesaid guide hole located inthe leading end of the aforesaid stripper.

A punch press tool according to a fourth aspect of the present inventioncomprises: a die base; a die body supported on the aforesaid die base;and a die tip held in the aforesaid die body; wherein the aforesaid dietip comprises an appropriate number of forming die tips each including aforming portion in the leading end thereof and an appropriate number ofsub die tips each having a smaller size compared with the forming dietips; and both of the aforesaid tips are attached to the aforesaid diebody detachably and exchangeably.

A punch press tool according to a fifth aspect of the present inventionis a punch press tool according to the fourth aspect in which at leasteither the aforesaid forming die tips or the sub die tips are split intoa plurality.

A punch press tool according to a sixth aspect of the present inventioncomprises: a punch holder for the punch press; a sliding body supportedslidably within the aforesaid punch holder; and a punch tip forperforming press forming, which punch tip is attached to the leading endof the aforesaid sliding body; wherein the aforesaid punch tip includesan appropriate number of long forming punch tips each including a pressforming portion in the leading end thereof and an appropriate number ofclamping punch tips each having a shorter length compared with theforming punch tips; and the aforesaid forming punch tips and theaforesaid clamping punch tip are attached to the aforesaid sliding bodydetachably and exchangeably.

A punch press tool according to a seventh aspect of the presentinvention is a punch press tool according to the sixth aspect in whichat least either the aforesaid forming punch tips or the aforesaidclamping punch tips are split into a plurality.

Thus, by means of combining appropriately the aforesaid forming punchtips, the aforesaid clamping punch tips, the aforesaid forming die tipsand the aforesaid sub die tips, a downward or upward cut-and-raised andbent part can be formed in a portion of a workpiece.

In addition, by means of selecting the width for each of the aforesaidtips, the width and the spacing of a bent part can be selected freely,and the punch tips and the die tips can be exchanged for forming variousbent parts having various bent width.

Furthermore, when forming into a downward cut-and-raised and bent partin a workpiece, the workpiece can be clamped between the projectedportion provided in the leading end of the stripper and the clampingpunch tip, so that a bent part can be obtained with high accuracy.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a cross-sectional front view of a punch press tool forexecuting the present invention.

FIG. 2A shows a cross-sectional front view of a punch tip for downwardforming.

FIG. 2B shows a bottom view of a punch tip for downward forming.

FIG. 3A shows a cross-sectional front view of a punch tip for downwardclamping.

FIG. 3B shows a bottom view of a punch tip for downward clamping.

FIG. 4 shows an exploded perspective view of a leading end of a punchbody, which end receives punch tips disengageably.

FIG. 5 shows an exploded front view of a leading end of a punch body,which end receives punch tips disengageably.

FIG. 6A shows a cross-sectional front view of a stripper.

FIG. 6B shows a bottom view of a stripper.

FIG. 7A shows a cross-sectional front view of a die tip for downwardforming.

FIG. 7B shows a plan view of a die tip for downward forming.

FIG. 8A shows a cross-sectional front view of a downward sub die tip.

FIG. 8B shows a plan view of a downward sub die tip.

FIG. 9A shows a side view of an example of combinations of a punch tipfor downward forming with punch tips for downward clamping and of a dietip for downward forming with downward sub die tips.

FIG. 9B shows a perspective view of an example of a workpiece providedwith a downward bent part that is formed with the tools shown in theforegoing FIG. 9A.

FIG. 10A shows a side view of an example of combinations of punch tipsfor forming and a punch tip for clamping and of die tips for forming andsub die tips.

FIG. 10B shows a perspective view of another example of a workpieceprovided with downward bent parts that are formed with the tools shownin the foregoing FIG. 10A.

FIG. 11 shows a cross-sectional front view of a punch press toolaccording to an embodiment other than the die shown in FIG. 1.

FIG. 12A shows a cross-sectional front view of a punch tip for upwardforming.

FIG. 12B shows a bottom view of a punch tip for upward forming.

FIG. 13A shows a cross-sectional front view of a punch tip for upwardclamping.

FIG. 13B shows a bottom view of a punch tip for upward clamping.

FIG. 14A shows a cross-sectional front view of a die tip for upwardforming.

FIG. 14B shows a plan view of a die tip for upward forming.

FIG. 15A shows a cross-sectional front view of a downward sub die tip.

FIG. 15B shows a plan view of a downward sub die tip.

FIG. 16A shows a side view of an example of combinations of a punch tipfor upward forming with punch tips for clamping and of a die tip forforming with sub die tips.

FIG. 16B shows a perspective view of an example of a workpiece providedwith an upward bent part that is formed with the tools shown in theforegoing FIG. 16A.

FIG. 17A shows a side view of an example of combinations of punch tipsfor upward forming with punch tips for clamping and of die tips forforming with sub die tips.

FIG. 17B shows a perspective view of another example of a workpieceprovided with an upward bent part that is formed with the tools shown inthe foregoing FIG. 17A.

THE BEST MODE FOR CARRYING OUT THE INVENTION

Hereunder, the best mode of carrying out the present invention will bedescribed in detail referring to the attached drawings.

FIG. 1 shows a punch press tool 1 of high precision according to thepresent invention. This punch press tool 1 is constructed of a punchtool 3 and a die tool 5. In the aforesaid punch tool 3, a punch guide 9is provided to be slidable upward and downward within a hole 7H formedin a upper die supporting member 7 that serves as a punch holder. Withinthe punch guide 9, supported slidably upward and downward (upward anddownward in FIG. 1) are a punch tip 11, a punch body 13 provideddetachably on the upper side of the punch tip 11 and a punch driver 17connected integrally to the punch body 13 by means of a threaded portion15.

There is provided a flange portion 19 on the upper end of the aforesaidpunch guide 9. This flange portion 19 includes a locking groove 39formed on a circumference surface thereof, and an O ring 21 as a lockingmember is inserted into the locking groove 39. The aforesaid punchdriver 17 consists of a middle portion 23 with an outer diameter d and alower portion 25 with an outer diameter 25, in which the outer diameterd is adapted to be smaller than the outer diameter D. And a retainercollar 27 having an inner diameter smaller than the outer diameter D ofthe lower portion 25 is provided slidably upward and downward outsidethe middle portion 23. Accordingly, the retainer collar 27 is slidablealong only the middle portion 23 of the punch driver 17. Further, apunch head 29 is mounted on the upper end of the punch driver 17.

Between the retainer collar 27 and the punch head 29, a resilientlystripping member such as a stripper spring 31 is provided for constantlybiasing the retainer collar 27 and punch head 29 to press them apart.

Surrounding the peripheries of the retainer collar 27 and the stripperspring 31, a slide collar 33 that servers as a fixing member is disposedslidably. On the internal surface of the lower end of the slide collar33, a locking projection 37 is formed. This locking projection 37 servesto press downward a clamping projection 35 formed in the lower end ofthe retainer collar 27 so as to allow the lower end of the slide collar33 to engage lockably the O-ring 21 disposed in the flange portion 19 ofthe punch guide 9. Between the flange portion 19 of the aforesaid punchguide 9 and the upper surface of the upper die supporting member 7, alifter spring 20 is disposed for biasing upward the punch guide 9constantly.

Referring to FIG. 2A together with FIG. 2B, FIG. 3A and FIG. 3B, theaforesaid punch tip 11 comprises an appropriate number of forming punchtips 41 each of which includes a press forming portion in the leadingend portion thereof and has a length L1 and an appropriate number ofclamping punch tips 43 each of which has a shorter length L2 comparedwith that of the forming punch tip 41 (L2<L1). Both tips 41 and 43 arereceived in the aforesaid punch body 13 detachably.

FIG. 2A and FIG. 2B show the forming punch tip 41. Referring to FIG. 2A,the head portion 41B has projections 41D in the bottom thereof, whichprojections project toward right and left with respect to the bodyportion 41C so as to make a step in the vertical direction. FIG. 3A andFIG. 3B show the aforesaid clamping punch tip 43. Referring to FIG. 3A,in the similar manner to the forming punch tip, the head portion 43B hasprojections 43D in the bottom thereof, which projections project towardright and left with respect to the body portion 43C so as to make a stepin the vertical direction.

The aforesaid forming punch tips 41 are prepared preliminarily withvarious widths T such as the width T1 for one piece and the width 2T1for two pieces. Also, the aforesaid clamping punch tips 43 are preparedpreliminarily with various widths T such as the width T1 for two pieces,the width 1.5T1 for two pieces and the width 2T1 for one piece.

Referring also to FIG. 4 and FIG. 5, in the leading end portion 13A ofthe aforesaid punch body 13, a punch receiving recess 45 including anopening 13C is formed in the leading end surface 13B. Further, in theleading end portion 13A of the punch body 13, locking recesses 47including openings 47A formed on the periphery surfaces thereof andcommunicating with the aforesaid punch receiving recess 45 are formed. Alocking piece 49 is provided with an engaging surface 49A in an innerside thereof, which is adapted to be engageable with a peripheralsurface of the punch tip 11 attached inside the aforesaid punchreceiving recess 45. The locking piece 49 is disposed detachably in oneof the aforesaid locking recesses 47, and the paired locking piece isdisposed in the other locking recess located oppositely to the foregoinglocking recess. The engaging surface 49A of the aforesaid locking piece49 is formed with the shape corresponding to a shape of the outerperiphery of the punch tip 11.

The forming punch tip 41 and the clamping punch tip 43, both of whichcompose the aforesaid punch tip 11, are provided with the projections41D and 43D respectively on the respective head portions 41B and 43Bthereof, which projections project horizontally with respect to theaforesaid locking recess 47 and are engageable with the engaging surface49A of the aforesaid locking piece 49. Moreover, the aforesaid punchbody 13 is provided with a key 53 in the peripheral surface thereof, andthis key 53 is received in a key groove 9A that is formed on the punchguide 9.

At the leading end (lower end) of the aforesaid punch guide 9, across-shaped plate 55 is fitted, and inside this plate 55 a cross-shapedplate 57 is fixed by means of a bolt or the like. Referring also to FIG.6A and FIG. 6B, at the center of this plate 57 a stripper 59 isdisposed, which stripper is formed with a guide hole 59H for receivingand guiding the aforesaid punch tip 11 composed of the forming punchtips 41 and the clamping punch tips 43. On the leading end of thisstripper 59, a projected portion 59T is disposed adjacent to theaforesaid guide hole 59H, which projected portion serves for clampingthe work sheet.

The aforesaid die tool 5 is, as shown in FIG. 1, mounted within amounting hole 61H disposed in the lower die supporting member 61, and adie body 67 is supported on a die base 63 via a die holder 65 andfastened by means of a bolt 69. Within respective holes 71 and 73 thatare formed in the center of the aforesaid die holder 65 and the die body67 respectively, a die tip 75 is held detachably. The aforesaid die tip75 comprises an appropriate number of the forming die tips 77, whichhave a size L3, having a forming portion 77A as shown in FIG. 7A andFIG. 7B as well as an appropriate number of the sub die tips 79, whichhave a size L4 smaller than L3 (L4<L3), as shown in FIG. 8A and FIG. 8B.Such tips, i.e., the forming die tips 77 and the sub die tips 79 aredisposed detachably and exchangeably in the aforesaid die body 67.

The aforesaid forming die tips 77 are prepared preliminarily withvarious widths T such as width T1 for one piece and width 2T1 for twopieces. Also, the aforesaid sub die tips 79 are prepared preliminarilywith various widths such as width T1 for two pieces, width 1.5T1 for twopieces and width 2T1 for one piece.

According to the construction described above, as shown in FIG. 5, theappropriate number of forming punch tips 41 and the appropriate numberof clamping punch tips 43 are bound together to form the punch tip 11.Such bound tips are inserted from the right in the figure into anopening formed in the leading end surface of the punch receiving recess45 that is disposed in the leading end portion 13A of the punch body 13.And, when a pair of the locking pieces 49 are mounted within the lockingrecess 47, which is formed in such a manner that the openings 47A formedon the peripheral surface of the leading end portion 13A of theaforesaid punch body 13 communicate with the aforesaid punch receivingrecess 45, the engaging surface 49 formed in the inner side of thelocking piece 49 comes to engage the peripheral surface of the punch tip11. The punch body 13 including the punch tip 11 is accommodated in thehole 9H formed in the punch guide 9, which is shown in FIG. 1.

As shown in FIG. 1, when the top of the punch head 29 is struck by meansof a striker that is not shown, the punch guide 9 moves downward againstthe bias of the lifter spring 20. While the punch guide 9 moves downwardfurther, the lower surface of the projected portion 59T of the stripper59 and the upper surface of the forming die tip 77 hold the workpiececooperatively, and the forming die tip 77 performs to cut-and-raise andto bend downward for forming a bent part.

By way of example, as shown in FIG. 9A, one piece of the forming punchtip 41 with the width T1, two pieces of the clamping punch tips 43 withthe width T1 and one piece of the clamping punch tip 43 with the widthT2, and one piece of the forming die tip 77 with the width T1, twopieces of the sub die tips 79 with the width T1, two pieces of the subdie tips 79 with the width 1.5T1 and two pieces of the sub die tips 79with the width 2T1 are combined together into two sets. And when suchcombinations are used for bending a workpiece downward, a downwardcut-and-raised and bent part can be obtained as shown in FIG. 9B.

Alternatively, as shown in FIG. 10A by way of example, one piece of theforming punch tip 41 with the width T1, one piece of the forming punchtip 41 with the width 2T1 and one piece of the clamping punch tip 43with the width 21T, and one piece of the forming die tip 77 with thewidth T1, one piece of the forming die tip 77 with the width 2T1, twopieces of the sub die tips 79 with the width T1, two pieces of the subdie tips 79 with the width 1.5T1 and one piece of the sub die tip 79with the width 2T1 are combined together into two sets. And when suchcombinations are used for bending a workpiece downward, a downwardcut-and-raised and bent part can be obtained as shown in FIG. 10B.

Furthermore, by making use of the forming punch tip 41, the clampingpunch tip 43, the forming die tip 77 and the sub die tip 79, and bymaking various combinations through varying the width and the number ofthese tips, various bent parts that have bent widths other thandiscussed above and appropriate spacing can be obtained.

FIG. 11 shows a punch tool 81, which is an alternative to the same shownin FIG. 1, for a high precision punch press according to anotherembodiment of the present invention. In FIG. 11, it is shown that thepunch tool 81 of a punch press comprises a punch tool 83 and a die tool85.

In the aforesaid punch tool 83, there is included an upper diesupporting member 87 as a punch holder, which member is provided with ahole 87H. A punch body 89 as a sliding body is accommodated in this holeslidably upward and downward. On the top of the punch body 89, a punchhead is mounted. Between a lower surface of the punch head 91 and anupper surface of the aforesaid upper die supporting member 87, there isinterposed a lifter spring 93 that biases the punch body 89 upwardnormally.

In the leading end (lower end) of the aforesaid punch body 89, across-shaped plate 95 is fitted, and another cross-shaped plate 97 isfixed to the forgoing plate 95 by means of a bolt or the like.Furthermore, a punch tip 99 is inserted into the center portion of theaforesaid plate 95.

The punch tip 99 comprises, referring to FIG. 12A together with FIG.12B, FIG. 13A and FIG. 13B, an appropriate number of forming punch tips101, each of which is provided with a press forming portion 101A in theleading end thereof and has a long size L5, and an appropriate number ofclamping punch tips 103, each of which has a size L6 (L6<L5) shorterthan that of the forming punch tip 101. Both of the aforesaid tips 101and 103 are attached to the aforesaid punch body 89 exchangeably.

The aforesaid forming punch tips 101 are prepared preliminarily withvarious widths such as the width T1 for one piece, width 2T1 for twopieces and the width T3 for one piece. Also, the aforesaid clampingpunch tips 103 are prepared preliminarily with various widths such asthe width T1 for two pieces, the width 1.5T1 for two pieces and thewidth 2T1 for one piece.

The aforesaid die tool 85 is, as shown in FIG. 11, accommodated in amounting hole 105H disposed in a lower die supporting member 105, and adie holder 109 is fixed on a die base 107 by means of a bolt 111. On thedie holder 109, an ejector plate 113 is mounted, and this ejector plate113 is biased against the die holder 109 upward normally by means of aspring 115.

Within holes 117 and 119 formed in the center of each of the aforesaiddie holder 109 and the ejector plate 113, the die tip 121 is helddetachably. The aforesaid die tip 121 comprises, as shown in FIG. 14Aand FIG. 14B, an appropriate number of die tips 123, each of which isprovided with a forming portion 123A in the leading end (upper end)thereof and has a size L7, and an appropriate number of sub die tips 125each having a size L8 smaller than L7 (L8<L7). A combination of both ofthe forming die tips 123 and the sub die tips 125 is attached to theaforesaid die holder 109 detachably and exchangeably.

The aforesaid forming die tips 123 are prepared preliminarily withvarious widths T such as the width T1 for one piece, the width 2T1 fortwo pieces and the width T3 for one piece. Also, the aforesaid sub dietips 125 are prepared preliminarily with various widths T such as thewidth T1 for two pieces, the width 1.5T1 for two piece and the width 2T1for one piece.

According to the construction described above, as shown in FIG. 11, whenthe leading end of the punch head 91 is struck with a striker that isnot shown, the punch body 89 moves downward against the biasing forcefrom the lifter spring 93. While the punch body 89 moves downwardfurther, the lower surface of the forming punch 101 presses the uppersurface of the aforesaid ejector plate 113 against the biasing forcefrom the spring 115 and the upper surface of the forming die tip 123presses upward the workpiece, so that an upward cut-and-raised part canbe obtained.

By way of example, as shown in FIG. 16A, one piece of the forming punchtip 101 with the width T1, two pieces of the clamping punch tips 103with the width T1, two pieces of the clamping punch tips 103 with thewidth 1.5T1 and one piece of the clamping punch tip 103 with the widthT2, and one piece of the forming die tip 123 with the width T1, twopieces of the sub die tips 125 with the width T1, two pieces of the subdie tips 125 with the width 1.5T1 and one piece of the sub die tip 125with the width 2T1 are combined together into two sets. When performingan upward cut-and-raising and bending on a workpiece W by means of thesesets, an upward cut-and-raised and bet part shown in FIG. 16B can beobtained.

Alternatively, as shown in FIG. 17A, two pieces of the forming punchtips 101 with the width 2T1, two pieces of the clamping punch tips 103with the width T1 and one piece of the forming punch tip 101 with thewidth 2T1, and two pieces of the forming die tips 123 with the width2T1, two pieces of the sub die tips 125 with the width T1 and one pieceof the sub die tip 125 with the width 2T1 are combined together into twosets. When performing an upward cut-and-raising and bending on aworkpiece W by means of these sets, an upward cut-and-raised and bentpart shown in FIG. 17B can be obtained.

Furthermore, by making use of the forming punch tips 101, the clampingpunch tips 103, the forming die tips 123 and the sub die tips 125 and bymaking various combinations through varying the width and the number ofthese tips, various bent parts which have bent widths other thandiscussed above and appropriate spacing can be obtained.

It should be noted that all of the substances of the Japan PatentApplication No. 2002-172740 filed on Jun. 13, 2002 be incorporated inthis specification by a reference.

Furthermore, the present invention should not be limited by theembodiment of the present invention described above, and otherembodiments may be executed by providing appropriate changes to thepresent invention.

1. A punch press tool comprising: a cylindrical punch guide; a punchbody fit slidably into said punch guide; and a punch tip for performingthe press forming, wherein said punch tip comprises an appropriatenumber of forming punch tips each including a press forming portion in aleading end thereof and an appropriate number of clamping punch tipseach having shorter length compared with said forming punch tips; andboth of said tips are attached to said punch body detachably andexchangeably.
 2. The punch press tool according to claim 1, wherein atleast either said forming punch tips or said clamping punch tips aresplit into a plurality.
 3. The punch press tool according to claim 2,wherein said punch guide is provided with a stripper in the leading endthereof, said stripper including a guide hole for receiving and guidingboth of said tips; and said stripper is provided with a projectedportion for clamping a workpiece in a position adjacent to said guidehole located in the leading end of said stripper.
 4. A punch press toolcomprising: a die base; a die body supported on said die base; and a dietip held in said die body; wherein said die tip comprises an appropriatenumber of forming die tips each including a forming portion in a leadingend thereof and an appropriate number of sub die tips each having asmaller size compared with said forming die tips; and both of said tipsare attached to said die body detachably and exchangeably.
 5. The punchpress tool according to claim 4, wherein at least either said formingdie tips or said sub die tips are split into a plurality.
 6. A punchpress tool comprising: a punch holder for punch press; a sliding bodysupported slidably within said punch holder; and a punch tip forperforming press forming, said punch tip provided in a leading end ofsaid sliding body; wherein said punch tip comprises an appropriatenumber of long forming punch tips each including a press forming portionin a leading end thereof and an appropriate number of clamping punchtips each having a shorter length compared with said forming punch tips;and said forming punch tips and said clamping punch tips are attached tosaid sliding body detachably and exchangeably.
 7. The punch press toolaccording to claim 6, wherein at least either said forming punch tips orsaid clamping punch tips arez split into a plurality.